Easiest would be to set AZ and EL to optimally receive Astra2, then tune to the amateur transponder frequency and turn the dish slowly towards the west until you see the stations on the transponder (or at least the beacons) and optimize on those. The EL probably doesn't have to change for this small dish.
It is easy to find if your dish is optimally aligned once the bolts have been tightened by gently forcing the edges east-west and up-down and see if the signal improves when moved from the neutral position. If so, loosen the bolts and re-align.
When you have no access to the receive signal strength when you are handling the dish it is all a lot more difficult, so at least try to arrange that. 2nd best would be to have someone watching the receiver and issuing directions by shouting or using some handheld radios/phones, but this is a lot trickier than watching the signal strength while adjusting it yourself.